COMPONENTS
SRM-5AShort Haul RAD® Modem
www.campbellsci.com/srm-5a
questions & quotes: 435.227.9120
RAD
SRM-5A2(data storage)
RAD
SRM-5A
SRM-5AU L
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Top View RCVXMT
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SRM-5A(data storage)
Bottom view
1RAD is a registered trademark of RAD Data Communications, Inc. Rochelle Park, NJ. 2The SC932A is used to connect the modem to the datalogger’s CS I/O port. Configuration is more complicated when connecting the modem to the datalog-ger’s RS-232 port; contact Campbell Scientific for more information.
(1) PC running PC200W, PC400, or LoggerNet Software.(2) 7026 serial cable, which is a DB-25 male to DB-9 female.(3) SRM-5A Short Haul modem, two required.(4) Joslyn 4-wire surge protector model 6536 for use with PC.(5) 4-wire unconditioned phone line or the CABLE2TP-L Santoprene- jacketed, 2-twisted-pair cable with shield.
(6) 6361 Joslyn 4-wire surge protector for use in an enclosure.(7) SC932A DCE Interface2 and a 9-to-25 pin adapter. The 15770 Rad Modem Interface Kit includes the SC932A, adapter, and a mounting bracket. (8) SC12 cable (provided with SC932A).(9) Campbell Scientific datalogger
PC-to-Datalogger Hookup
OverviewThe SRM-5A is an asynchronous modem used for local communi-cation between a datalogger and a computer. Two SRM-5A Short Haul RAD® Modems1 are required; one at the datalogger end and
one at the computer end. Each short haul modem transmits over an unconditioned 4-wire telephone line or the CABLE2TP two-twisted pair cable. Data rates up to 9,600 bps are possible.
Benefits and FeaturesProvides the easiest link for communicating with one datalog-ger over longer distancesLow voltage transmission levels minimize crosstalk between adjacent lines within the same cable
Data are transmitted and received at a balanced impedance, providing excellent immunity to circuit noiseTransmits up to 10 km (6.2 miles) at 9600 bpsTransmits up to 12.2 km (7.6 miles) at 1200 bps
SOLARTEMP CRH %
1:2:3:
Scale = Auto
Logger Time 00:03:54FlagsPorts
H=Help
G R +-
= Graph enter/exit= Re-scale= Incr. auto exponent= Decr. auto exponent
V = View save to fileF1. . F8 = Toggle flagsP1. . P6 = Toggle portsC = Collect data
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RAD SurgeProtector
SC25PS or7026 cable
4-Wire Unconditioned Telephone Lineor two Twisted Pairs
Datalogger Interface RAD SurgeProtector
Environmental Enclosure
SC12Cable
PCLOGRAD(data storage)
23 4 5
78
9 3 6
or CABLE2TP-L cableSRM-5A
SRM-5A
1
© 1997, 2017Campbell Scientific, Inc.
January 4, 2017
Campbell Scientific, Inc. | 815 W 1800 N | Logan, UT 84321-1784 | (435) 227-9120 | www.campbellsci.comUSA | AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | SE ASIA | SOUTH AFRICA | SPAIN | UK
SpecificationsData Rates: up to 9,600 bpsTransmission Mode: Asynchronous, full duplex, 4-wire operationTransmission Range: up to 12.2 km (7.6 miles) depending on data rate and wire gage; see Approximate Range TableLine Interface: 5-screw (4-wire and ground) connector block with cable strain relief inside plastic coverTransmission Line: CABLE2TP (for short RS-232 or prewired enclosures) or unconditioned, 4-wire telephone lineTransmission Level: 6 dBmTerminal Interface: EIA RS-232-C/CCITT V.24, female integral 25-pin connectorOperating Temperature Range3: 0° to 60°CAltitude: up to 3000 m (10,000 ft)
Humidity: up to 95% non-condensingLength: 5.2 cm (2.1 in)Width: 5.2 cm (2.1 in)Height: 1.8 cm (0.7 in)Weight: 38 g (1.3 oz)
Power RequirementsAt Computer: uses low power from the EIA RS-232-C/CCITT V.24 data and control signalsAt Datalogger: combined current drain of the SRM-5A modem and SC932A, which is 2.2 mA quiescent, and 10 to 15 mA activeProtection: ac/dc over voltage connected via isolation trans-formers rated at 1,500 V RMS
Approximate Range, miles and kmData Rate 19 Gage (0.9 mm) 24 Gage (0.5 mm) 26 Gage (0.4 mm)
bps miles km miles km miles km
9,600 6.2 10.0 2.8 4.5 2.0 3.3
1,200 7.6 12.2 3.4 5.5 2.5 4.0
3Manufacturer’s operating temperature range specification is listed. Limited tests conducted by Campbell Scientific has shown the SRM-5A to perform at temperatures over -25° to +50°C.
RADmENC2(data retrieval)
SE 1 2 3 4 5 6 7 8
H1 2 3 4
LDIFF
H EX1
H LH LL P2P1
12VG
DC ONLYCAUTION
LUGGROUND
POWER IN
WIRING PANELCR1000
PERIPHERAL PORT
RS-232 (Not Isolated)
SN:
CS I/O
MADE IN USA
11109SE 15 1613 1412
HLDIFF
H EX2
H LH LL EX35 6 7 8
SW-1
2
5V 12V
12V
C5
C4
G G G G C1
C2
C3
G GC6
C7
C8
TxCOM1
Rx Tx Rx Tx Rx Tx RxCOM2 COM3 COM4POWER OUT
SDM
G 12V
BATTERY - INTERNAL (12V 7 AMP HOUR)
BATTERY - EXTERNAL RECHARGEABLE BATTERY
CHARGE - CHARGING VOLTAGE PRESENT
OFF - ON - POWER TO 12V TERMINALS
CHARGE
CHARGE
+12V
+12V
}
}FROM CHARGER OR SOLAR PANEL16-28VDC OR 18VAC RMS+ TO EITHER TERMINAL, – TO OTHER
POWER TO DATALOGGERSOR 12V PERIPHERALS
Logan, Utah
WARNING:PERMANENT DAMAGE TO RECHARGEABLE CELLS MAYRESULT IF DISCHARGEDBELOW 10.5 VOLTS
PS100 12V POWER SUPPLYWITH CHARGING REGULATOR
LIFT TOREMOVE
MADE IN USA
6361 Surge Protector
ENC12/14 Enclosure
Rechargeable Power Supply
CR1000
SC12 Cable
SC932A
SRM-5A